MANGANESE UNDER ACID AND NEUTRAL SOIL CONDITIONS. 6 
paths 2'J feet wide separating the plats. One strip, or a series of 
seven plats, was treated with manganese sulphate; the other strip 
of seven plats was not treated and served as a control, or check. 
Seven crops, rye, wheat, timothy, clover, corn, cowpeas, and pota- 
toes, were grown on both the treated and untreated plats, which lie 
side by side in the two strips. The crops on the plats were not 
rotated, but each crop grew year after year on the same plat. The 
manganese sulphate was applied annually, before the crops were 
planted, at the rate of 50 pounds per acre. The corn, cowpeas, and 
potatoes were planted in the spring of each year and harvested in 
the fall, and the wheat and rye were planted in the fall and harvested 
the next July. The timothy and clover plats were planted in 1907^ 
and the ground was again plowed and reseeded in 1909. 
The results for the six years from 1907 to 1912, inclusive, are 
given briefly in Table I and will permit a short discussion here, 
the reader being referred to the earlier publications previously men- 
tioned for the results in detail. The yields are calculated to pounds 
and bushels per acre and are so given in the table. The wheat and 
rye were not thrashed, the yield being given in weight of straw plus 
grain. The timothy and the clover were a failure on this soil; these 
plats produced practically no yield and no results were obtained. 
Table I. — Effect of manganese sulphate on the yields per acre of wheat, rye, cowpeas, 
corn, and potatoes on an acid soil treated for six successive years (1907 to 1912, 
inclusive) . 
Wheat. 
Rye. 
Cowpeas. 
Year. 
Un- 
treated. 
Treated 
with 
mangan- 
ese sul- 
phate. 
Increase 
or de- 
crease of 
mangan- 
ese plat. 
Un- 
treated. 
Treated 
with 
mangan- 
ese sul- 
phate. 
Increase 
or de- 
crease of 
mangan- 
ese plat. 
Un- 
treated. 
Treated 
with 
mangan- 
ese sul- 
phate. 
Increase 
or de- 
crease of 
mangan- 
ese plat. 
1907 
Pounds. 
Pounds. 
Pounds. 
Pounds. 
Pounds. 
Pounds. 
Pounds. 
8,320 
8,800 
5,920 
4,320 
6,720 
3,360 
Pounds. 
6,720 
6,560 
4,480 
3,360 
5,600 
3,520 
Pounds. 
-1,600 
-2, 240 
-1,440 
- 960 
-1,120 
- 160 
1908 
1909 
1910 
1911 
1912 
4,960 
4,160 
4,000 
4,000 
3,840 
4,320 
3,680 
3,520 
3,360 
2,400 
- 640 
- 480 
- 480 
- 640 
-1,440 
5,280 
4,160 
1,920 
3,680 
2,240 
4,160 
4,640 
1,600 
4,000 
2,720 
-1, 120 
+ 480 
- 320 
+ 320 
+ 480 
Corn. 
Potatoes. 
Year. 
Untreated. 
Treated with man- 
ganese sulphate. 
Increase or de- 
crease of man- 
ganese plat. 
Un- 
treated. 
Treated 
with 
mangan- 
ese sul- 
phate. 
Increase 
or de- 
crease of 
Stover. 
Grain. 
Stover. 
Grain. 
Stover. 
Grain. 
mangan- 
ese plat. 
1907 
1908 
1909 
1910 
1911 
1912 
Pounds. 
9,120 
4,160 
4,320 
6,240 
4,800 
5,440 
Bushels. 
60 
71 
20 
40 
40 
46 
Pounds. 
10, 400 
3,360 
3,040 
4,320 
4,000 
2,720 
Bushels. 
40 
51 
17 
23 
20 
9 
Pounds. 
+1, 280 
- 800 
-1,280 
-1, 920 
- 800 
-2, 720 
Bushels. 
-20 
-20 
- 3 
-17 
-20 
-37 
Bushels. 
221 
120 
181 
147 
2*3 
85 
Bushels. 
152 
80 
221 
96 
152 
61 
Bushels. 
-69 
-40 
+ 40 
-51 
-91 
-24 
